Journal
NEURON
Volume 26, Issue 3, Pages 659-670Publisher
CELL PRESS
DOI: 10.1016/S0896-6273(00)81202-7
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Funding
- NEI NIH HHS [R01 EY11116] Funding Source: Medline
- NINDS NIH HHS [F32 NS010991-02, F32 NS010991-01, R01 NS36853, F32 NS010991, K02 NS01839, F32 NS010991-03] Funding Source: Medline
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AMPA and NMDA receptors are coexpressed at many central synapses, but the factors that control the ratio of these two receptors are not well understood. We recorded mixed miniature or evoked synaptic currents arising from coactivation of AMPA and NMDA receptors and found that long-lasting changes in activity scaled both currents up and down proportionally through changes in the number of postsynaptic receptors. The ratio of NMDA to AMPA current was similar at different synapses onto the same neuron, and this relationship was preserved following activity-dependent synaptic scaling. These data show that AMPA and NMDA receptors are tightly coregulated by activity at synapses at which they are both expressed and suggest that a mechanism exists to actively maintain a constant receptor ratio across a neuron's synapses.
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